/*_############################################################################
  _## 
  _##  SNMP4J 2 - Integer32.java  
  _## 
  _##  Copyright (C) 2003-2011  Frank Fock and Jochen Katz (SNMP4J.org)
  _##  
  _##  Licensed under the Apache License, Version 2.0 (the "License");
  _##  you may not use this file except in compliance with the License.
  _##  You may obtain a copy of the License at
  _##  
  _##      http://www.apache.org/licenses/LICENSE-2.0
  _##  
  _##  Unless required by applicable law or agreed to in writing, software
  _##  distributed under the License is distributed on an "AS IS" BASIS,
  _##  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  _##  See the License for the specific language governing permissions and
  _##  limitations under the License.
  _##  
  _##########################################################################*/
package org.snmp4j.smi;

import java.io.*;
import org.snmp4j.asn1.BER;
import org.snmp4j.asn1.BERInputStream;

/**
 * The <code>Integer32</code> represents 32bit signed integer values for SNMP.
 *
 * @author Frank Fock
 * @version 1.8
 */
public class Integer32 extends AbstractVariable implements AssignableFromInteger, AssignableFromString {

    private static final long serialVersionUID = 5046132399890132416L;

    private int value = 0;

    /**
     * Creates an <code>Integer32</code> with a zero value.
     */
    public Integer32() {
    }

    /**
     * Creates an <code>Integer32</code> variable with the supplied value.
     * @param value
     *    an integer value.
     */
    public Integer32(int value) {
        setValue(value);
    }

    public void encodeBER(OutputStream outputStream) throws java.io.IOException {
        BER.encodeInteger(outputStream, BER.INTEGER, value);
    }

    public void decodeBER(BERInputStream inputStream) throws java.io.IOException {
        BER.MutableByte type = new BER.MutableByte();
        int newValue = BER.decodeInteger(inputStream, type);
        if (type.getValue() != BER.INTEGER) {
            throw new IOException("Wrong type encountered when decoding Counter: " + type.getValue());
        }
        setValue(newValue);
    }

    public int getSyntax() {
        return SMIConstants.SYNTAX_INTEGER;
    }

    public int hashCode() {
        return value;
    }

    public int getBERLength() {
        if ((value < 0x80) && (value >= -0x80)) {
            return 3;
        } else if ((value < 0x8000) && (value >= -0x8000)) {
            return 4;
        } else if ((value < 0x800000) && (value >= -0x800000)) {
            return 5;
        }
        return 6;
    }

    public boolean equals(Object o) {
        return (o instanceof Integer32) && (((Integer32) o).value == value);
    }

    public int compareTo(Variable o) {
        return value - ((Integer32) o).value;
    }

    public String toString() {
        return Integer.toString(value);
    }

    public final void setValue(String value) {
        this.value = Integer.parseInt(value);
    }

    /**
     * Sets the value of this integer.
     * @param value
     *    an integer value.
     */
    public final void setValue(int value) {
        this.value = value;
    }

    /**
     * Gets the value.
     * @return
     *    an integer.
     */
    public final int getValue() {
        return value;
    }

    public Object clone() {
        return new Integer32(value);
    }

    public final int toInt() {
        return getValue();
    }

    public final long toLong() {
        return getValue();
    }

    public OID toSubIndex(boolean impliedLength) {
        return new OID(new int[] { value });
    }

    public void fromSubIndex(OID subIndex, boolean impliedLength) {
        setValue(subIndex.get(0));
    }

}
